Grease composition for tapered roller bearing

Abstract

A grease composition for a tapered roller bearing, containing: (a) at least one compound selected from the group consisting of metal salts in which the valence of the metal group is 2 as an additive; (b) a base oil including a synthetic oil having a viscosity index of 110 or higher and a pour point of -35 DEG C or lower, in a ratio of at least 40% with respect to the base oil as a whole; (c) a thickener; and (d) an antioxidant.

Description

technical field [0001] The present invention relates to a grease composition and a tapered roller bearing using the same. Background technique [0002] Grease compositions used as lubricants used in rolling bearings such as tapered roller bearings are generally composed of a thickener, base oil and additives. For example, tapered roller bearings are widely used as bearings supporting axles of vehicles represented by railway vehicles and automobiles. As an example, as a rolling bearing supporting the axle of an automobile, as described in Non-Patent Document 1 and Non-Patent Document 2, the rolling body includes a spherical hub unit using beads, a tapered hub unit using tapered rollers, and the like. Large vehicles such as SUVs and small trucks, commercial trucks, and other heavy vehicles use tapered hub units using tapered rollers and tapered roller bearings to support larger loads. However, in the case of using tapered hub units and tapered roller bearings, although a lar...

AI Technical Summary

Problems solved by technology

[0006] The use of aromatic diurea for the thickener and mineral oil for the base oil has been proposed as a grease composition that takes into account the durability and fretting wear resistance of tapered hub units using tapered rollers and tapered roller bearings. and / or synthetic hydrocarbon oils, greases using organic molybdenum compounds as additives (Patent Document 1), but low torque performance and low temperature performance are not mentioned

In addition, as a grease composition that suppresses fretting wear in a low-temperature environment, a grease composition using an alicyclic aliphatic diurea as a thickener, mineral oil as a base oil, and amine phosphate as an additive has been proposed (patent Document 2), but there is no record about low-temperature startability. In addition, regarding fretting wear in a low-temperature environment, it is also assumed that the rotating body is a ball instead of a tapered roller.

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